ICEEYA PURCmsi. 75 



stage (figured p. 73), as seen after being in a preservative 

 fluid for some time, it was of a reddish tint, with black 

 legs and antennae and black eyes, and was furnished at 

 the tip of the abdomen with six long fine hairs. The 

 horns at this stage appear to me to be formed of five 

 joints and a club. The lowest joint broad and short, 

 about half the length and twice the width of the 

 succeeding joint, and broadest at the farthest end from 

 the head ; the following four joints are almost cylindrical, 

 the second of these being longer than the first and 

 slightly contracted at the centre : a very few long scat- 

 tered hairs were observable on the joints of the horns. 



Prof. Trimen notes that when the Bug has reached 

 about one-sixth of an inch in length it begins to secrete 

 the snow-white, waxy, but cotton-like, matter, which 

 presently forms a nest beneath the mother insect for the 

 salmon-coloured eggs. " For some time after the white 

 secretion " has begun to grow the Dorthesia remains 

 tolerably active, continuing to move about, and change 

 its feeding-ground on " the plant; but gradually, as the 

 ova develop and the cottony secretion proportionately 

 enlarges, its power of motion seems to decrease, and at 

 length it remains firmly anchored to one spot by its 

 sucker " ; and as time goes on the newly-hatched young 

 are to be found, which leave the cottony nest beneath the 

 dead mother, and, being gifted with much greater powers 

 of locomotion at this stage than later on, seek actively 

 for a suitable place where they may settle down to feed 

 (see Prof. Trimen's Eeport). 



The observations of Mr. Bairstow and Prof. Trimen, 

 above quoted, taken together, give a large part of the 

 life-history that is needed for practical service. We 

 have observations of the eggs hatching in the white 

 deposit, and the little Buglets coming out and spreading 

 actively from under the dead skin of the mother Bug ; 

 also of this activity continuing more or less from about 

 the beginning of February until at least the 21st of 

 March : we have further the observations of the white 

 secretion under the Bug beginning when it is about the 



